package com.nowcoder.community.entity;

/**
 * @ClassName Page
 * @Description
 * @Author hhwu
 * @Date 2022/5/17 10:25
 * Version 1.0
 **/
// 封装分页相关的信息
public class Page {
    //当前页码
    private int current = 1;
    // 显示上限
    private int limit = 10;
    // 数据总数（用于计算总行数）
    private int rows;
    // 查询路径（用于复用分页连接）
    private String path;

    public int getOffset() {
        /**
         * @Author hhwu
         * @Description //TODO获取当前页的起始行
         * @Date 10:32 2022/5/17
         * @Param []
         * @return int
         **/
        return (current - 1) * limit;
    }

    public int getTotal() {
        /**
         * @Author hhwu
         * @Description //TODO 获取总页数
         * @Date 10:38 2022/5/17
         * @Param []
         * @return int
         **/
        if (rows % limit == 0) return rows / limit;
        else return rows / limit + 1;
    }

    public int getFrom() {
        /**
         * @Author hhwu
         * @Description //TODO 获取起始页码
         * @Date 10:39 2022/5/17
         * @Param []
         * @return int
         **/
        int from = current - 2;
        return from < 1 ? 1 : from;
    }
    
    public int getTo() {
        /**
         * @Author hhwu
         * @Description //TODO 获取结束页码
         * @Date 10:39 2022/5/17
         * @Param []
         * @return int
         **/
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if (current >= 1) {
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if (limit >= 1 && limit <= 100) {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if (rows >= 0) this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
}
